Hot-air furnace.



No. 707,437. Patented Aug. 19,1902.

-\ T. J. MARCH.

HOT AIR FUBNACE.

(Application led. Feb. 5, 1902.) (llo Model.) A

INHIIIIMNMI l IIIIIIIIllllllllllllllllmlI-llllll-llllll-II u Hummm! WTNESSES litten THOMAS J. MARCH, OF POTTSTOVN, PENNSYLVANIA.

HOT-AIR FURNACE.

SPECIFIGATION formingpart of Letters Patent N o. 707,437, dated August 19, 1902.

Application led February 5, 1902. Serial No. 92,729. (JN0 model.)

To all rtf/1,0m it may concern:

Beit known that I, THOMAS J. MARCH, a resident of Pottstown, in the county of Montgomery and State of Pennsylvania, have invented certain new and useful Improvements in Hot-Air Furnaces; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improvement in hot-air furnaces, the object of the invention being to utilize to the greatest extent the heat from the products of combustion and to insure a supply of hot air to points a long distance from 'the furnace; and with this object in View the invention consists in certain novel features of construction and combinations and arrangements of parts, as will vbe more fully hereinafter described, and pointed out in the claims.

In the accompanying drawings, Figure 1 is aview in elevation of the furnace with the outer air-casing removed. Fig. 2 is a View in vertical section of the same. Fig. 3 is a view in sectiouon the line :n a; of Fig. 3, and Fig. 4 is a View of a modification.

l represents the combustion-chamber of a furnace, 2 the ash-chamber below the same, 3 and i the fuel and ash doors, respectively, and 5 the air-casing, all of any approved construction and design,but preferably as shown.

At the rear of the combustion-chamber 1 and inclosed in the casing 5 is my improved drum 6, which comprises an outer elliptical casing 6, an inner elliptical sleeve 7 of appreciably smaller diameter than the casingG and connected thereto at its ends by funnelshaped or flaring rings S, forming an air-passage through said sleeve 7, and an annular chamber between the sleeve and casing which is connected with the combustion-chamber by a short llue D and is provided with a ver iical partition or baille-plate 10, extending from the upper end down the desired distance to compel the passage of the products of combustion throughout the annular chamber before escaping through the smoke-pipe to be att-ached to a collar ll near the upper end of said drum and preferably opposite to the in-` let of said chamber, and thus insure the heating of air passing up through the sleeve by the otherwise waste products of combustion. The casing 6 is also provided near its lower end with a door 12 to permit the cleaning of dirt and soot from the chamber, and the drum is preferably supported on legs 13, as shown, to permit the free entrance of air into the sleeve 7. On top of this drum a funneled cap 14 is located andadapted to be connected by a vcurved elbow with an air-line to direct the hot air into said flue and facilitate longdistance heating, or, inother words, insure a supply of heated air to a room a long distance from the furnace. i

On each side of the combustion-chamber l and preferably located at the juncture of the combustion-chamber and drum 6 are semicylindrical tubes 15, forming chambers open at their lower ends and provided at their upper ends with a closing-plate 15, common to both,and having openings over the chambers, around which openings collars 16 are secured and connected by curved elbows with airiiues to direct the hot air passing up through said heating-chambers 15 into flues for longdistance"heating, and it will be seen that these chambers utilize the heat from both the combustion-chamber and the drum to heat the air passing therethrough. Of course the upper end of casing maybe provided with the ordinary flues, and the purpose of my invention is not to change the construci tion of an ordinary furnace, butto employ in addition thereto my improved mechanism above described for insuring a supply of hot air to distant points and which otherwise would receive little if any heat, as the greater portion thereof would escape through the shortest flues,

As many air-heating chambers 15 may be employed as desired, and I have illustrated in Fig. 4. a series of these chambers extending around both sides of the combustionchamber and all preferably closed by a top plate 17, provided above each chamber with a collar 18 for the attachment of l'lues, and a great many changes might be resorted to in the general form and arrangement of the several details set forth without departing from my invention, and hence I would have it understood that I do not limit myself to the precise details set forth, but consider myself at liberty to make such slight changes and al- IOO terations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, What I claim as new, and desire to secure by Letters Patent, is

1. In afurnace,the combination with a combustion-chamber, of a series of hot-air tubes abutting against the combustion-chamber and open at their lower ends, a plate covering the upper ends of said hot-air chambers, and means on said plate for the direct connection with said chambers of hot-air-circulating iues.

2. In afurnace,the combination with a combustion-chamber and a drum located a short distance from and communicating with said combustion-chamber, of hot-air chambers l0- cated between and abutting against the combustion-chamber and said drum, said chambers open at their lower ends, means at the upper ends of said chambers for the direct attachment of hot-air iues, a sleeve or tube extending through the said drum and open at both ends, and means at the upper end of said sleeve or'tube forthe direct attachment of a hot-air flue.

3. In a furnace, the combination with a furnace-casing and a combustion-chamber therein, of a drum located near the combustionchamber and communicating therewith, a sleeve or tube open at its ends and located in said drum, said sleeve having Haring ends closing the ends of the chamber between said sleeve or tube and the wall of the drum, a cap on the upper end of said drum, communicating with the sleeve or tube and means on said cap for the direct attachment of a hotair iiue.

4.y In afurnace,the combination Withacombustion-chamber and an inclosing casing, of a sleeve forming a hot-air chamber, an annular chamber inclosing the sleeve and having an inlet and an outlet at its upper end on opposite sides thereof, a partition or partitions projecting down a proper distance into said annular chamber, a Ilue connecting the inlet of said annular chamber with the combustion-chamber, and a funneled cap on said sleeve adapted to be connected with a hot-air flue.

In testimony whereof I have signed this specification in the presence of two subscribing Witnesses.

THOMAS J. MARCH.

Witnesses:

HENRY M. MILLER, H. M. EBERT. 

